<template>
  <div class="list" ref="wrapper">
    <div>
      <div class="area">
        <div class="title border-topbottom">当前城市</div>
        <div class="button-list">
          <div class="button-wrapper">
            <div class="button">{{this.$store.state.city}}</div>
          </div>
        </div>
      </div>
      <div class="area">
        <div class="title border-topbottom">热门城市</div>
        <div class="button-list">
          <div class="button-wrapper" v-for="item in hotCities" :key="item.id">
            <div class="button"
                 @click="handleCityClick(item.name)"
            >{{item.name}}</div>
          </div>
        </div>
      </div>
      <div class="area"
           v-for="(item, key) in cities"
           :key="key"
           :ref="key"
      >
        <div class="title border-topbottom">{{key}}</div>
        <div class="item-list" v-for="data in item" :key="data.id">
          <div class="item border-bottom"
               @click="handleCityClick(data.name)"
          >{{data.name}}</div>
        </div>
      </div>
    </div>
  </div>
</template>

<script>
import BScroll from 'better-scroll'
import { mapActions } from 'vuex'
export default {
  name: 'list',
  props: {
    hotCities: Array,
    cities: Object,
    letter: String
  },
  mounted () {
    this.scroll = new BScroll(this.$refs.wrapper)
  },
  updated () {
    this.scroll.refresh()
  },
  activated () {
    this.scroll.refresh()
  },
  methods: {
    // 将action的方法映射到methods里面
    ...mapActions(['cityChange']),
    handleCityClick (city) {
      this.cityChange(city)
      // this.$store.dispatch('cityChange', city)
      this.$router.push('/')
    }
  },
  watch: {
    // 监听letter发生变化，如果发生变化就显示限定区域
    letter () {
      if (this.letter) {
        const element = this.$refs[this.letter][0]
        // scrollToElement 是scroll提供的滚到某dom元素位置的方法，参数必须写dom元素
        this.scroll.scrollToElement(element)
      }
    }
  }
}
</script>

<style scoped lang="stylus">
  .border-topbottom
    &:before
      border-color: #ccc
    &:after
      border-color: #ccc
  .border-bottom
    &:before
      border-color: #ccc
  .list
    position absolute;
    left 0
    bottom: 0
    right: 0
    top 1.58rem
    overflow hidden
    .title
      line-height: .54rem
      background: #eee
      padding-left: .2rem
      color: #666
      font-size: .26rem
    .button-list
      overflow: hidden;
      padding: .1rem .6rem .1rem .1rem
      .button-wrapper
        float: left
        width: 33.33%
        .button
          margin: .1rem
          padding: .1rem 0
          text-align: center
          border: .02rem solid #ccc
          border-radius: .06rem
    .item-list
      .item
        line-height: .76rem
        padding-left: .2rem
</style>
